refactor(interaction): extract world selection query

Move render-hit validation, live target classification, closest-hostile search, selection spheres, use/pickup gates, range checks, and approach parameters behind a read-only App-layer query owner. GameWindow now supplies runtime seams and delegates instead of owning those algorithms.

tests/AcDream.App.Tests/World/LiveEntityRuntimeTests.cs

@@ -28,6 +28,7 @@ public sealed class LiveEntityRuntimeTests
     private sealed class AnimationRuntime(WorldEntity entity) : ILiveEntityAnimationRuntime
     {
         public WorldEntity Entity { get; } = entity;
+        public uint CurrentMotion { get; init; }
     }
 
     private sealed class EffectProfile : ILiveEntityEffectProfile { }